Oracle® Fusion Middleware

Monitoring and Managing With the Java EE Management APIs for Oracle WebLogic Server

11g Release 1 (10.3.5)

E13736-05

April 2011

This document describes the Java EE Management APIs which enable a software developer to create a single Java program that can discover and browse resources, such as JDBC connection pools and deployed applications, on any Java EE Web application server.

Introduction and Roadmap

The Java EE Management specification describes a standard data model for monitoring and managing the run-time state of any Java EE Web application server and its resources. It includes standard mappings of the model through a Java EE Management EJB Component (MEJB).

The following sections describe the contents and organization of this guide—Monitoring and Managing With the Java EE Management APIs for Oracle WebLogic Server:

Document Scope and Audience

This document is a resource for software developers who develop management services for Java EE applications and for software vendors who develop JMX-compatible management systems. It also contains information that is useful for business analysts and system architects who are evaluating WebLogic Server or considering the use of JMX for a particular application.

The information in this document is relevant during the design and development phases of a software project. The document does not address production phase administration, monitoring, or performance tuning topics. For links to WebLogic Server documentation and resources for these topics, see Related Documentation.

It is assumed that the reader is familiar with Java EE and general application management concepts. This document emphasizes a hands-on approach to developing a limited but useful set of JMX management services. For information on applying JMX to a broader set of management problems, refer to the JMX specification or other documents listed in Related Documentation.

For guidelines on developing other types of management services for WebLogic Server applications, see the following documents:

Using WebLogic Logging Services for Application Logging describes WebLogic support for internationalization and localization of log messages, and shows you how to use the templates and tools provided with WebLogic Server to create or edit message catalogs that are locale-specific.

Using the Java EE Management APIs on WebLogic Server

The Java EE Management APIs enable a software developer to create a single Java program that can discover and browse resources, such as JDBC connection pools and deployed applications, on any Java EE Web application server. The APIs are part of the Java EE Management Specification, which requires all Java EE Web application servers to describe their resources in a standard data model.

The following sections describe how to use the Java EE Management APIs on WebLogic Server:

Understanding the Java EE Management Model and APIs

In the Java EE Management data model, each instance of a Web application server resource type is represented by a Java EE Managed Object (JMO). The Java EE Management Specification describes exactly which types of resources must be represented by a JMO. JMOs themselves contain only a limited set of attributes, which are used to describe the location of the object in the data model.

JMO Hierarchy

The data model organizes JMOs hierarchically in a tree structure. The root JMO is J2EEDomain, which represents a collection of Web application server instances that are logically related. J2EEDomain contains the object names for all instances of the J2EEServer JMO, each of which represents a server instance in the collection.

Java applications can browse the hierarchy of JMOs, recursively querying for object names and looking up the JMOs that are named by the query results.

JMO Object Names

Each JMO instance is identified by a unique object name of type javax.management.ObjectName. The names follow this pattern:

The MEJB and JMOs are available only on the Administration Server. This is consistent with the Java EE Management Model, which assumes that most Java EE Web servers exist within some logically connected collection and that there is a central point within the collection for accessing or managing the server instances. From the Administration Server, a Java application can browse to the JMO that represents any resource on any server instance in the WebLogic Server domain.

Because WebLogic Server implements its JMOs as a wrapper for its MBeans, any changes in a WebLogic Server MBean that corresponds to a JMO is immediately available through the Java EE Management APIs.

For all JMO object names on WebLogic Server, the domain: portion of the object name corresponds to the name of the WebLogic Server domain.

Accessing the MEJB on WebLogic Server

To retrieve monitoring data through the MEJB:

Look up the javax.management.j2ee.ManagementHome interface through the Administration Servers JNDI tree under the name ejb.mgmt.MEJB.

Use ManagementHome to construct an instance of javax.management.j2ee.Management, which is the MEJB's remote interface.

Example: Querying Names of JMOs

The example class in Example 1 accesses the MEJB for a WebLogic Server domain and invokes javax.management.j2ee.Management.queryNames method. This method returns the object name for all JMOs in the domain.

WebLogic Server Extensions

WebLogic Server implements an extension to JSR 77 that gives you access to WebLogic-specific deployment descriptors using the MEJB, just like the standard J2EE deployment descriptors. The productSpecificDeploymentDescriptor attribute returns the XML contents of the WebLogic-specific descriptor file. Example 2 illustrates calling the method.

Example 2 productSpecificDeploymentDescriptor

// Get the WLS specific deployment descriptor.
// This is similar to the call for the standard descriptor
// (i.e., the "deploymentDescriptor" attribute)
//
dd = (String) managementBean.getAttribute(objName, "productSpecificDeploymentDescriptor");
// It returns a string containing the contents of the WLS specific deployment
// descriptor. This is the XML file contents as a string.

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